Pediatric Intramuscular Hematoma

Etiology: trauma, post-procedural, anticoagulation
US: acutely hypoechoic lesion within muscle, chronically may be septated, isoechoic, or calcified
CT: acutely see diffuse isodense enlargement of a muscle which may have areas of high density, chronically appear low density
Complications: infection, calcification

Radiology Cases of Intramuscular Hematoma

CT of intramuscular hematoma in patient on extracorporeal membrane oxygenation (ECMO) — Axial CT with contrast of the chest shows hematomas in the right sternocleidomastoid muscle (above) near the ECMO catheter insertion site and left pectoralis major muscle.